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A Spark of Holiday Cheer – Holiday Season 2024

Administrator
Every year, Lectromec creates a video to celebrate the holiday season. This year, we decided to utilize some of the lab’s high voltage test equipment. This year’s holiday video titled, “A Spark of Holiday Cheer” showcases the how far AC arcs can be drawn out at different voltages. Starting at just over 15kV, the arcs […] Read more

Understanding Outcomes of Scrape Abrasion Testing

Michael Traskos
Scrape abrasion is a useful test for aviation wiring, although liable to inherent variability in test data. Thus, the results should be considered as a general assessment rather than a specific time to failure. Variability in the wire, cable, and wire harness construction will impact the test performance. In this Lectromec article, we examine how these factors impact scrape abrasion results and the value of such results when such variability is inevitable. Read more

Aluminum Conductors

Michael Traskos
While there are benefits to replacing copper wires with aluminum, parts selection must align with the specific installation requirements. Here, we discuss the fundamentals of aluminum conductors, their limitations as described by aerospace standards, and techniques for their implementation. Read more

Testing and Qualification of Fuses

Michael Traskos
Aircraft electrical fuse testing includes electrical, mechanical, chemical, and thermal conditions that are representative of the aircraft in question. This article discusses the basics of electrical fuses and how they are qualified for aerospace use. Read more

High Voltage, Low Current Material Arc Resistance Testing

Megan Chambellan
Long-term exposure to high-voltage can cause an insulating material to break down and, over time, even form conductive paths along its surface. The ASTM D495 test method is a preliminary assessment of an insulating or dielectric materials’ resistance to carbon arc tracking. In this article, we discuss this test method as well as the impact and limitations of the provided results. Read more

Understanding Filter line Cables: Purpose, Construction, and Key Concepts

Michael Traskos
The primary purpose of filter line cables is to minimize EMI and RFI, which are prevalent in environments with high levels of electromagnetic noise. In this article we discuss the unique construction and application of filter line cable to better understand how these cables can be utilized in high-interference environments to protect electrical signals. Read more

To Shield or Not to Shield – A Question on High Voltage DC Cables

Michael Traskos
Shielding on aerospace cables offers several benefits but can introduce some drawbacks that must be considered. In this article, we explore the pros and cons of using shielded cables on aircraft. Read more

AS50881 and Connectors

Michael Traskos
Amidst the vast amount of aerospace standards, AS50881 stands out as a comprehensive guide to requirements to ensure wire termination safety specifically in connector installation and design. In this article, we discuss some of the important guidelines for connector installation, separation, and identification covered by AS50881. Read more

Inspectability of EWIS

Michael Traskos
Though EWIS should be protected from hazards such as tampering, FOD, and fluid exposure, the system does need to be periodically inspected and maintained throughout its service life. In this article, we discuss some of the industry guidance, regulations, and methods commonly used to ensure accessibility of the EWIS for the appropriate personnel. Read more

Insertion Loss and Attenuation

Michael Traskos
Insertion loss and attenuation are similar concepts, but one is assigned to a single component (insertion loss) whereas the other is assigned to generalized performance (attenuation). In this article, we will discuss the similarities and differences of these concepts and how proper testing of each can ensure reliability in signal transmission. Read more